. >>> the fbi is trying to track down the person behind the airline hoax. the culprit called police this morning and they said a particular passenger would try to carry a dangerous substance on to the u.s. airways flight from philadelphia to dallas. that flight was already in the air, but the plane quickly returned to philadelphia. police, they detained the passenger who was named by the caller and searched the plane, but they did not find anything dangerous. it resulted in really a big threat to all the passengers. >> reporter: they said the person that made the phone call could be looking at pretty stiff criminal charges. >> yeah, note remotely there. >> it seems like they have a smart day to make you feel connected to your friends, to help you find direction. just about anything you need. >> reporter: but at what point did the applications become an addiction? well, a recent survey here finds 65% of the respondents say they cannot live without their phones. 40% say they would give out coffees first. 18% said they would stop bathing every day before parti